To flash the using Ultimate Multi Tool (UMT) , you must use the UMT MTK module because this specific model uses the MediaTek MT6750 chipset . Prerequisites Hardware : UMT Dongle/Box and a high-quality USB cable.
In tools like SP Flash Tool, you can format the entire flash. Formatting erases the IMEI, Bluetooth address, and calibration data. A "Full Flash" via UMT is a direct binary write that preserves the NVRAM (User data and radio calibration). nokia ta1070 flash file umt full